Tire pump



May l0 192"7.

sNQRAM NRE PUMP Filed Dec. 4, 1922 2 Sheets-$heet 1 1/6 8 @antw W. M. INGRAM TIRE PUMP May lo 2 Sheets-Sheet 2 Filed Dec.

Quorum,

Y WALTER M. INGRAM, or BALTIMORE, iviARYLANn,r AssieNloR .To THE RELI/ANci-i' Patented May 10, 1927.

Afl,alii-friSED l m2233155 PATE-Nar Erica."

f PUMP 'AND MACHINE .coMPANxor BALTIMORE, MARYLAND, A coRroR'ATioN 0F MARYLAND. .TIRE

App-iieation sied December The invention relates 'to a pump which in tliefform shown" is manually actuated, for compressing air.' It is commonly used for the inflationiof automobile and bicycle tires andthe like. In such pumps,k the valves are on'eof the principal sources of difficulty withandfailure of theapparatus, and while compounding ris necessary to give the requisite quick action,vincreasing the` number of valves on this account increases the difficulty incident to their operation. Likewise there is increased resistance incident to the passage of air through the'. valves. th-epresent' invention is to overcome these dinficulties, producing a valveless compound fpump'of slightY resistance, long life and compact arrangement.

In the form shown, the low pressure cylinder is of "annular cross section, the high pressure cylinder occupying the center of y the annulus', the axis of the two being" coiny cident,the two .cylinders as slio'wn'are upright, theY intake to the highA pressure cylinder, or as it is termed herein, the transfer port from the low to tlieliiglr pressure `cyliiiderbeing preferably' near the base. In

the form shown, the latter cylinder is raised slightly from lthe 'base for this purpose',- i.

` eto provide' such a port or passage between f the base and the bottom edge of the high pressure fc'ylinde'r.

`packed by al double cup or double flanged ring' sotliat the Yair passes the pistons; inv

fone directioinv'but not iiifthe other.'y y

In short,` the cylinders arejconcentric one "within theother, the intake and delivery being' at one endand the transfer "port at rf the other and the edges of the packingcups vare' `turned inthedirection in which the air is compressed, i. e. the'low vpressure 'pack- ,hgltowardf the transfer portand the high 'pressuretoward deliveryA I On thev down stroke, air `is drawn into the 'low pressure cylinder and on the up stroke itpasses the low pressure piston being drawn -ifnto`the h'ighvp'ressure cylinder bythe up f stroke oftflier'piston inthat itiibeing The obj-ect `of The.v intake 'to the VlowA pressure cylinder is at theY top, ,as around.vv

PUMP.

4, 1922'. serial No. 604,713.

yunderstood that the pistons in the two cylinders move together, being connected to a single grip or handle by three piston rods. At the .same time that the air is being dra-wn into one endv of the high pressure cylinder as aforesaid, the air above the piston is being 'compressed and forced outward through the delivery opening which'iis atthetop. On the `down stroke, the high pressure piston permits the air which was drawn inbeneath it. to pass the piston and the low pressure Vpiston on its up stroke permits the air which has entered above it to pass into the space beneath the pistons read to be transferred to the high pressure cy inder on'Y theneXt 'down stroke. Y 'Y In the accompanying drawings, I have-illustrated a pump constructed in accordance with my invention. In the drawings;

f Y Figure lis a'vertical central section'.

Fig.l 2 is a sectionof'the top' portion of the cylinders alsoon a. vertical plane at right "angles to the section of F ig. l, the same being-on the line Q- Qof `Fig. 3.

ton 'rodsfB- of F 1i, `looking downward atthe top of the cylinders. Y Fig. 4 isfa section on the line 4 4 of Fig. l,ilook`ing downward lat the pistons and at the base.` i Fig. 51 is a vertical central section and Fig isa .section on line 6 6 ofFig. 7, of ainodified form ofthe pump, showing the cap fastening.

It`i'g. 7is` an elevation of the top portion zof the cylinder, and Fig. 8 shows' the inside of the cup. y i

Referring to t-he drawings byr numerals, thejpump' as shown'consists 'off an outer at 2, and securedto vthe base 4,-as hereinafter described. Theouter cylindrical casing l, has an inwardly inclined taper, i..e.'a frusto conical portion 6. at the top which terminatesV in a cylindricalV neck-7, of smaller diameter than the outercasing l. Asshown it is' approximately half the diameter of the outercylinder.' In this neck there is secured in any suitable "manner a' tubular member or Vinner cylinderj8,iwhich fits tiglitlywitliin' thel neck 7, and may be held'by soldering or braz'ing cr-by ymerelybeing forced into the' nneck opening.

Fig; 3is'a section taken throughthe pis' ,cylindricalr casing 1, iianged at the bottom` inner cylinder forms `the Vhigh presand the nut Q0.

inner cylinder S,

sure cylinder oit the puinp. is shown, its

lower end is spaced `slightly upward troni the hase el, termine' a` transter port 1.3, connecting' the high and loir pressure cylinder.

',llieonter casing,` l, or atlier the space lielueeii the outer casini; and inner or high pressure cylinder 8, 'terms the loir pressure cylinder. The upper end ot' the high pressure cylinder S is closed hy a plus' 9 which is apertured at l0, cent rally, and in alignment with the axis ot the Cylinder to adniit the hioh pressure piston rod ll. The extreme iipper end ot tlio'eylinder il is threaded at lll. to en ;.i'apje a parking! nut il. and suitable parliiiigl l5, shown in ihr Yl'orni oil1 a Washer is rlaiiiped. lietn'een the nut 'l-Ll; and the plug! l), the latter haring; a pechino' rhauiher le, forn'iedliy eiilaroinol the upper end ot the annular opening lll therein. The packing; in the forni ot a centrally cupped sott wash-er placed on the plug; Sl, and the nut lil, is screwed down thereon, or any suitahle pacle ingr inay he used.

In the liiejli pressure cylinder is a piston packed with a cup Washer, the saine heinesullieiently loose to pass the air on the down stroke, oliering' hy iiieans ot the usual cup packing; action sutlirient resistance to its paswune on the up stroke to hold the air and to coinpress it, forcing; it through the deliii'ery opening, which as shown is s pplied with a suitahle Fitting' in the nature ot a hose connection '1.8. The piston as shown consists ot a concave disc 19, secured to the piston rod 1l. near the end, and a renioralile nut 20, which engages the rod and holds the cup Washer 2l which is ot the ordinary type eenli'ally apertured and lient upward around y the disc 19, so that its edges lie flat against the cylinder Walls extending;` in the direction o deli very, the Washer heine' lietween the dise The lonY pressure piston as shown consists ot a ring or annulns 2Q, which [its loosely within the annular low pressure spare 9.3, between the outer casing' il, and the This is secured by rivetw inge),` or otherwise to tivo or more piston rods 2l. `which extend up vard through apertures 2li, in the `conical portion 6 at the top et' the cylinder. these openings as aforesaid lieing auiiicieiitly :tree to provide an air intalte opening' for that purpose. An annular `cup washer 2G, having; its tiro respective `circular edges turned downward into contact with the inner Walls ol the outer casingl l, and the inner Walls oit the inner cylinder S. held in position oiilthe bottoni tace ot' the rino; Q2, hy a. sccondfriiiglj` 27, which may `he riveted or otherwise secured to the ringr l. the washer heine' between the rings.

.l'uiporta n t points are that the `@vlinders are concentric, oiieenelosingr the other and the cup parkings have their edges turned in opposite directions, i. e. the washer in the high pressure eylinder has its edges turned toward delivery and the Washer in the low pressure cylinder has its edges turned toward the transfer port and no valves are necessary.

The three piston rods 2d, Q4 and 1l are parallel and preferably in line transversely so that they niay to advantage he, all three et tlieiii secured to a transverse handle or grip 30, heini;` toadiuintage as shown sliouldered at 3l near the upper ends. The end portions 3Q pass through the handle and are held hy the nuts 32?, shitahle washers being provided at hotli sides ol the handle to he en raged by the shoulders at one end and the nuts at the other. outer eyliiider .iiiay he paeked hy nieans oit a suitable nailart Ill, and held `'l'roin above hy the east iron hase ring 235, the saine having `ears 3G at opposite sides which are slotted at Il? to receive the hase holts 3S.

lii l-Fifi'ures .il (i, and 7, l have shown a uiodiiied torni ol? the invention. has the low pressure cylinder 84:, closed at the top hy a removable cap 35, which fits iiiside the openingl el cylinder. Except for the reino 'ahle feature and the taper which is non-essential, it is like` the top of the low pressure cylinder of the tir-st torni.

'llie loir pressure cylinder is secured to the hase Sie., at the liottoin hyspinning` the 1oottoiii edge ot the cylinder outward at 37, to lit a `groove or expanded portion 380, ot a .socket ill), formed in the hase 'lor that purpose. `The hase is prelerahly hossed up at l0 around the socket. i e,

The ineans for fastening the `cap is peculiar, liotli the cap and the cylinder being provided with peripheral registerinfY grooves 4l and 4t2 in the overlapping portion of these respective ineniliers, the cap being preferably shouldered at 43,` to position thogrooves. The grooves when in registrative relation lorni a cii'ciiniteieiitial passage 44, oit circular cross section between the iiiernloers 34.- and 35. dition, see Fig'. S, is a wireliolt l5 ot spring steel in the ,torni ol u single ring, eoiicentric with, `and lying against the inside ot the cap and .havingI hotli eiidslree, one end 46 being; turned out through a slot Il?, in the `ap, which sloticuts out part ot the groove in the cap coinciding `therewith and extending in the direction ot the circumference. The other end i-9 is turned inward` The cylinder has aslot 48 extendingdownward` :from the top edges thereol'l to the groove and preferably enlarged toward the top. llVlien the cap is placed on the cylinder, the end 4G, projects outward through the slot 48,`i1i the cylinder to which slot 48, the end of the Wire holt is thus secured, As the cap is turned right handed, the Wire is drawn through the slot l? in the cap into the passage between the cap and cylinder, being` half in one groove and halt in the other, see

'llie hase flange 2, ot' the` Tl iis 'forni Inside the :ap in untastened con-` "SII Figs. 5 and 6. When a compl-ete turn has been made the rotation is stopped by Contact of the two ends of the wire bolt, Fig. 6, the inner end 49 being hooked over the end of the slot 47. To unlock it the cap is oppositely rotated, forcing the wire back through the slot 47, to its original positionl inside the cap.

lhave thus described specifically and in detail a. single embodiment of my invention in the preferred form in order that the nature and operation of same may be clearly understood by those skilled in the art ;v however, the specific terms herein areused descriptively rather Vthan in a limiting sense, the scope of the invention being defined in the claims. i

Vhat I claim and desire to secure ters Patent is:

l. An air pump for inllating pneumatic tires consisting of an outer casing having a portion at the top of smaller diameter than the cylinder, a high pressure cylinder secured to said portion and extending down into the outer casing, a transfer portnear the bottom of the high pressure cylinder, the space between the inner cylinder and the Outer casing forming a low pressure cylinder, an annular piston having flexible packing edges extending downward along both walls of the low pressure cylinder, 'a piston in the high pressure cylinder having flexible packing with oppositely disposed edges,

by Letparallel piston rods connected to a single handle, a delivery opening near the top of the high pressure cylinder and an intake opening near the top of the low pressure cylinder.

2. In a pump the combination of two members, a cylinder and a removable cap for one end of the cylinder, the cylinder having a piston therein, and a piston rod, the-cap and cylinder having projecting cylindrical edges as to which edges one member encloses the other of said members, positioning means to limit the overlap of the edges of thecap and cylinder, which edges are prok vided each with a groove, the two grooves registering when the parts are positioned as aforesaid providing a closed passage encir' cling said members, one of said members having a hole extending through the groove, the other member having a .slot at an angle with the groove extending to and open at the edge of said member and a spring wire bolt of circular form, one end projecting outward through the slot when the two members are placed in cooperative relation and when the members are rotated the bolt is caused to occupy the passage between the two 1nembers locking them in closedposition substantially as described. I

. Signed by me at Baltimore, Maryland, this 1st day 'of December, 1922. Y

WALTER M. INGRAM. 

